Electrical phonograph apparatus



N 5, 1929. M. E. VANSmKLE 1,134,312

ELECTRICAL PHONOGRAPI'I APPARATUS Filed March 17. 1927 2 sheets-sneak 1 waa / ATTORN Y.

Nov. 5, 1929. M. E. VANSICKLE 1,734,312

ELECTRICAL PHONOGRAPH APPARATUS Filed March 17. 1927 2 Sheets-Sheet 2 IIZ'IIIIIIIIIIIIIIII V/IIIIIII/I' IN V EN TOR.

BY @M A TTORNEY patented Nov. 5, 1929 UNITED STATES) PATENT OFFICE imLvI n vANsIoxtn, or NEWARK, Nnw Jrinsnv, Assm'Non 'ro' nnANnEs nanomrronme, me, or NEWARK, NEW .rnnsnv, A. CORPORATION or NEW .rnnsmr ELECTRICAL; PHONOGBAPE APPARATUS Application filed March 17, 1927. Serial No. 176,087.

' system may be effected in accordance with a sound record.

Another object or my invention is to provide a construction of electrical piclmlp for phonographs wherein a movable armature member isso mounted with respect to the electromagnetic winding that vibrations transmitted from the sound record may be imparted to the armature members with minimum losses for effecting changes in the condition of the electromagnetic winding for correspondingly controlling the input circuit of an amplification system.

My invention will be more clearly understood from the specification hereinafter 01- lowing by reference tothe accompanying drawings in which:

Figure 1 is a side elevation illustrating the electrical pick-up device of my invention sup ported on the tone arm of a phonograp Fig. 2 is an enlarged cross-sectional view taken'through the phonograph pickup de-' vice of my invention; Fig. Sin a fragmentary cross-sectional view showing the arrangement of bearings which I provide for mounting the stylus in the phonograph ick-updevice; Fig. 4 is a side elevation of t eelectrical phonograph pick-updeylce w th the casing illustrated in cross-section- Fig. 5 1s a" longitudinal cross-sectional view taken through the phonograph pick-up on line 55 of Fig. 2; Fig. 6 1s flfliltGIflhQi'OSS-SBCUOQQ .view taken on line 6'6 of Fig. 2; and F1 7 is a cross-sectional view taken on line 7 ofFi.2.

Re arring to the drawings in deta1l,- ref 7 erence character 1 designates the phonograph form to which the electrical pick-up device of my invention in ladapted. The phonograph is provided with a 'record table 2 for F revolving a sound record 33A tonezarm 4:

is arranged to move with respect to the sound record 3 and carries at the end thereof a holder 5 to which the electrical pick-up of my invention is secured. The electrical pickup includes a permanent magnet system 6 of substantially U-shaped formation which embraces opposite ends of the electromagnetic winding 7 which is carried by the coil support 8. The permanent magnet system 6 is supported from one side of the enclosing casing 9 by suitable means such as screws 10, the casing being carried by the flanged portion 11 of the holder 5. The permanent ma net system 6 and the electromagnetic win ding 7 are boundas a rigid unit by means of a band member 12. The upper extremity of the permanent magnet 6 is tapered to form a pole face 14, while the lower extremity of the permanent. magnet system 6 is bifurcated with the parts 15 and 16 extending to substantially the opposite side of the electromagnetic winding. The bifurcated portions 15 and 16 are each provided with V-shaped extensions 17 and18, and on these V-shaped extensions there is mounted the rockable member19. The rockable member 19 consists of a pair of laterally extending portions- 20 and 21 each of which are provided with V-shaped grooves into which the V-shaped extensions 17 and 18 are centered. Sp1ral spring members 22 and 23 are secured to the hub portions on the laterally extending portions 20 and 21 for rockably supporting the stylus carrier on the V-shaped extensions 17 and .18. A spiral sprin member 22 is fastened by means of a pin 24 in the pole member 15 while the spiral spring member- 23 is fastenedby means of a screw member 25 in the ole member 16. It will be observed that the l-sh'aped extensions on which the stylus holder is pivoted are integrally con-. nected with the pole pieces 15 and 16 thereby simplifying the s stem of bearings and increasing the rigi 'ty of the structure. The rockable member-'19 includes a socket 26 and set screw 27 for securing a stylus needle 28 therein. An armature member 29 is positioned in the rockable member 19, the armature member consisting of a flat sheet re-. duced at its lower part as indicated at 30 for mounting in the rockable member 19. The upper end of the armature member 29 rests against a pad 31 for damping the vibration of the armature. Conductors 32 lead from the electromagnetic winding 7 and pass through the holder 5 for connection w th suitable contacts which may plug vinto 00- operating sockets in the tone arm 4,

It will be observed that the entire assembly of the parts of the electrical piclr up is extremely simple, and that by reason of such simplicity manufacture on a quantity production basis is greatly facilitated.

While I have described the construction of the electrical phonograph pick-up of my invention in one of its preferred embodiments, I desire that it be understood that modifications may be made andthat no limitations upon my invention are intended other than are imposed by the scope of the appended claims.

What I claim as new and desire to secure by Letters-Patent of the United States 18 as follows:

1. An electrical phonograph pick-up comprising a permanent magnet system, an electromagnetic system, said permanent magnet system embracing said electromagnetlc system and having a bifurcated pole member at one end thereof for pivotally mounting an armature member thereon, said armature member extending through said electromagnetic system, spring means mounted upon said permanent magnet system and normally biasing said armature member in a central position Within said electromagnetic system, and a stylus connected with said armature member for transferring mechanical vibrations to said armature member within said electromagnetic system.

2. An electrical pick-up for phonographs comprising an electromagnetic system, a permanent magnet system arranged to embrace opposite ends of said electromagnetic system, an armature member, one end of said permanent magnet system-being bifurcated for receiving pivot means on each side of said armature member, said armature member being connected to a stylus on one end and extending through said electromagnetic system at the opposite end, and coiled spring means connected between said last mentioned end of said armature member and said permanent magnet system for normally biasing said armature member in a central position within said electromagnetic system. 7

3. An electrical phonograph pick up device comprising an electromagnetic system, a permanent magnet system arranged to embrace opposite ends of said electromagnetic system, one end of said permanent magnet system being bifurcated, an armature member pivotally mounted within the bifurcated end of said permanent magnet system and extending through said electromagnetic system, and a pair of coil springs disposed between the opposite end of said permanent magnet system and said armature member for centering said armature member within said electromagnetic system and preventing excess vibration thereof.

4. An electrical phonograph pick up comprising a supporting member, a U-shaped permanent magnet carried by said supporting member one pole of said magnet being bifurcated, an electromagnetic winding disposed between the poles of said permanent magnet, an armature member centrally located within said electromagnetic winding, ,said armature member extending across both pole pieces of said permanent magnet, means for pivotally mounting said armature member within the bifurcated pole of said permanent magnet, a pair of coiled spring members independently secured to said pole members and to said armature member on opposite sides of said armature member, and a stylus connected with said armature member for imparting mechanical vibrations thereto whereby said armature member is moved. within said electromagnetic windin An electrical phonograph pick-up comprising a supporting member, a permanent magnet carried by said supporting member, said permanent magnet being substantially U-shaped and arranged to support an electromagnetic winding between the opposite poles thereof one pole of said magnet being bifurcated, an armature member pivotally mounted within the bifurcated pole of said permanent magnet and extending through said electromagnetic winding to a position adjacent the opposite pole of said permanent magnet, a stylus connected to one end of said armature member, and a pair of coil spring members one wound in a clockwise direction and the other in a counter-clockwise direction and secured between said armature and points adjacent the pivotal mounting there of for normally centering said armature member within said' electromagnetic windmg.

6. An electrical phonograph pick-up comprising a supporting member, a U-shaped permanent magnet having parallel extending pole pieces, an electromagnetic winding positioned between said pole pieces, one of said pole pieces being bifurcated and provided with bearing portions thereon, an armature member positioned within said electromagnetic winding and extending across one of said pole pieces and through said bifurcated pole piece, and means for pivotally mounting said armature member on the baring portions of said bifurcated pole piece.

7. An electrical phonograph pick-up comprising a supporting'member, a permanent magnet carried by said supporting member, said permanent magnet having pole pieces embracing opposite ends of an electromagnetic winding, one of the pole pieces of said permanent magnet being bifuracted and having bearing portions thereon, a rockable member pivotally mounted on said bearing portions, an armature member extending through said electromagnetic Winding and connected to said rockable member, and a stylus carried by said rockable member for imparting vibrations to said armature.

8. An electrical phonograph pick-up comprising a supporting member, a permanent magnet carried by said supporting member, said permanent member having pole pieces embracing opposite ends of an electromagnetic winding, one of said pole pieces being bifurcated, with V-shaped projections secured to the bifurcated portions of said pole piece, a rockable member having a pair of oppositely extending arms each pivotally centered in said V-shaped projections, spring means for balancing said rockable member in a neutral position with respect to the bifur. cated portions of said pole piece, and an armature member connected to said rockable member and extending through said electromagnetic Winding, and a stylus carried by said rockable member for imparting mechanical vibrations to said armature.

In testimony whereof I affix m h signature.

at MELVIN E. VAN ICKLE. 

